Breast cancer is a malignant tumor, or cancer, that begins in the cells of the breast. Breast cancer can affect both men and women, but it is about 100 times more common in women
The first sign of breast cancer is often a lump in your breast or abnormal mammogram. Breast cancer staged range from and early, curable disease to metastatic breast cancer—which means that the cancer has spread beyond the breast into other parts of the body.
There are two main types of breast cancer:
Ductal carcinoma begins in the breast ducts, behind the nipples. Ductal carcinoma affects 7 to 8 out of every 10 women with breast cancer and 9 out of 10 men with breast cancer.
Lobular carcinoma starts in the lobules, where the mammary glands are found. It affects 1 out of 10 women with breast cancer and 1 out of 50 men with breast cancer.
The remaining 1 in 5 women and 2 in 25 men with breast cancer may suffer from a combination of both types, or from a less common type, such as inflammatory breast cancer or Paget’s disease of the nipple.